Process of making leather



- or less hot in the drums.

applied during the drumming operation in-' stead of preliminarily thereto. \Vhen the UNITED STATES PATENT ori-lcu,

ALLEN ROGERS, 0F BROOKLYN, NEW YORK. U

rnoorss or MAKING LEATHER.

No Drawing.

To all whom it may concern:

Be it known that I, ALLEN ROGERS, a c1t1- zen of the United States,residing at Brooklyn, in the county of kings and State of New-York, have invented certain new and useful Improvements in Processes of Making Leather, of whichthe following 1s a specification.

This invention relates to processes of making leather;- and it comprises a process of making leather or tanning hides wherein the hides are first treated with an aluminum compound containing alumina in such a state as to render it capable of being taken upand are thereafter treated with shark liver oil; all as more fully hereinafter set forth and as claimed. I y i In the manufacture of leather from hides,-

cod liver oil is sometimes used; the skins being milled or worked with such cod liver oil and then packed down inyboxes to oxidize; or hung up in hot rooms to the same end. Some such means are-necessary to 1nitiate and continue oxidation; and in practice it is found that several repetitions of the" process are necessary-before the skins are thoroughly tanned. I have found that by, using shark liver oil I can muchabbreviatethe operation; that with shark liver Oll oxidation is initiated and continued without the usual packing down or hanging in hot rooms. The oxidation is also muchmore thorough and I can secure results ina single operation with shark liver oil which with cod liver oil require several.

In the present invention I utilize this fact ina particular manner; utilizing the leather Specification 0! Letters Patent.

' 'liquoring oil for light leather. in the manufacture. of chamois skin and 'shark liver oil.

Pate ted July 13,1920.

Application filed May 5, 1920. Serial It'd 379,050.

stock has been thoroughly saturated with Oll, t is simply hung u in drying rooms. During this hanging t orough oxidation takes placeand the tannage is completed.

After the hides or skins become of a dry' consistency they can be dampened again with water, oiled oil with tallow or other mixture, set out and finished in the usual manner. I

In the alum tanning stage, the hides may be submitted to a single or double bath containing sulfate of alumina or alum with chemicals adapted to convert the alumina lnto a condition in which it can be'adsorbed by the hlde. Any mildly alkalinev material,

such as soda,.-borax, sodium phosphate, etc.,

' maybe employed as such a chemical, either together with aluminum sulfate (sulfate of alumina) in a single bath processor subsequently thereto as in a 2-bath process. In the first stage of. the operation, in lieu of performing a mineral tannage with alulent bases, such as chrome (chromiumsesquigxid), or iron (iron sesquioxid) may be use.

. In ageneral way, I have found'that shark l V 7 liver oil 1s, because of itsfquickly oxidizing 7 properties, peculiarly advantageous in per forming an oil treatment subsequent to a preliminary tannage with other. materials. It 1s, for example, particularly advantageous }mina (aluminum sesquioxid), otherequivain stuffing ordinary belt leather, harness leather and latigo leather and also as a fat It is useful glove leather.

In the described treatmentusing shark liver oil it is not necessar' to add oxidizing catalysts of any kind, alt this may be done. I

What I claim is houghof course,

1. In the conversion of hides and skins into leather, the process which comprises submitting the material to a mineral tanning operation and then :to a treatment wit 2. In the conversion of hides y and skins into leather, the process which comprises 'submitting the material to a mineral tanning operation with a sesquioxid and then to atreatment with sharkliver oil.

3. In the conversion of hides and skins into leather, the process which comprises submitting the material to a mineral tanning operation with alumina and then to a treatment with shark liver oil.

hereto.

ALLEN ROGERS. 

